Hello,
> Is it really a G4 overheating problem holding things up?
Yes.
> I've seen passively cooled G4 macs
So have I, The ones I`ve seen have a huge heatsink on them. The A1G4 has (in my opinion) a tiny VGA heatsink and fan. It`s fine here in the UK, but aparently some people in warmer countries had stability problems.
Regards,
Frank,